QAccelerometer reports wrong timestamp information

[Lorn Potter]

The timestamp used in QtSensors is different than what is being reported.

Using a simple show_accelerometer example command:

phablet@ubuntu-phablet:~/sensors-examples$ show_acceleration/show_acceleration
 (main:134) - choosing "core.accelerometer"
Acceleration: -1.6 x 6.3 y 7.5 z m/s^21414974054854068592 (-235370 ms since last, -0.0 Hz)
Acceleration: -1.6 x 6.3 y 7.5 z m/s^21414974054859103992 (5035 ms since last, 0.2 Hz)
Acceleration: -1.6 x 6.3 y 7.5 z m/s^21414974054864139393 (5035 ms since last, 0.2 Hz)
Acceleration: -1.5 x 6.4 y 7.4 z m/s^21414974054869174793 (5035 ms since last, 0.2 Hz)
Acceleration: -1.6 x 6.4 y 7.4 z m/s^21414974054874210193 (5035 ms since last, 0.2 Hz)

It should be more like this:

Acceleration: 0.2 x 0.4 y 9.8 z m/s^2195476924274 ( 21 ms since last, 47.1 Hz)
Acceleration: 0.3 x 0.4 y 9.8 z m/s^2195476946157 ( 21 ms since last, 45.7 Hz)
Acceleration: 0.2 x 0.4 y 9.8 z m/s^2195476966758 ( 20 ms since last, 48.5 Hz)
Acceleration: 0.3 x 0.3 y 9.8 z m/s^2195476989252 ( 22 ms since last, 44.5 Hz)